How do wind turbines make electricity, and what are the trade-offs?
Topic 6.12 Wind Energy: describe how wind turbines generate electricity and evaluate the benefits and drawbacks of wind power.
A focused answer to APES Topic 6.12, covering how wind turbines convert wind into electricity, onshore and offshore wind, the benefits (renewable, low emissions, low operating cost) and drawbacks (intermittency, location, wildlife, noise) of wind power, and a worked wind farm output calculation.
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What this topic is asking
The College Board (Topic 6.12) wants you to describe how wind turbines generate electricity and evaluate the benefits and drawbacks of wind power.
How a wind turbine works
Benefits
Drawbacks
Why this matters
Wind is, with solar, a leading renewable and a direct alternative to fossil fuels, so it appears whenever the AP exam weighs energy choices for climate (Unit 9). Its dependence on windy sites links it to the global wind patterns of Unit 4, and its intermittency, shared with solar, is why storage and a diverse energy mix matter. Examiners often pair wind with solar in a free-response question and ask you to weigh their shared strengths (clean, renewable, no fuel cost) against their shared weakness (variability), then propose how storage, a diverse generation mix or demand management could keep supply reliable. Because wind and solar peak at different times, combining them, and backing them with storage or flexible hydro, smooths the overall output, which is the kind of systems-level reasoning the science practices reward.
Try this
Q1. Identify the form of energy in the wind that a turbine converts to electricity. [1 point]
- Cue. Kinetic energy (the energy of moving air).
Q2. Explain why wind power output varies over time. [2 points]
- Cue. Turbines generate electricity only when the wind blows, and produce more in strong wind and less or none when it is calm, so output rises and falls with wind speed, making wind intermittent.
Exam-style practice questions
Practice questions written in the style of College Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AP 2022 (style)4 marksSection II (FRQ). (a) Describe how a wind turbine generates electricity. (b) Identify one environmental benefit of wind power. (c) Identify two drawbacks of wind power. (d) Explain why wind farms are often built in coastal or open plains areas.Show worked answer →
A 4-point FRQ on wind energy.
(a) Describe (1 point): moving air turns the turbine blades, spinning a connected generator that produces electricity.
(b) Identify (1 point): wind power is renewable and emits no carbon dioxide or air pollutants during operation, with no fuel cost.
(c) Identify (1 point): any two of intermittency (no power when the wind is calm), harm to birds and bats, noise, visual impact, or limited suitable locations.
(d) Explain (1 point): coasts and open plains have stronger, steadier winds with fewer obstructions, so turbines there produce more electricity more reliably.
Markers reward the blades-spin-generator mechanism, the low-carbon benefit, two valid drawbacks, and the stronger-steadier-wind reason for siting.
AP 2019 (style)1 marksSection I (multiple choice). The main reason wind power cannot fully replace a constant electricity supply on its own is that it: (A) emits too much carbon dioxide (B) is intermittent and varies with wind speed (C) uses a nonrenewable fuel (D) is the most expensive source to operate. Justify your choice.Show worked answer →
A 1-point MCQ on wind power. The answer is (B).
Wind power is intermittent: turbines produce no electricity when the wind is calm and less when it is light, so output varies and storage or backup is needed for a steady supply. Wind emits no carbon dioxide while running (A), uses renewable wind not a fuel (C), and has low operating costs (D). The trap is confusing wind's variability (its real limitation) with emissions or fuel cost, which are actually its strengths.
Related dot points
- Topic 6.1 Renewable and Nonrenewable Resources: distinguish renewable from nonrenewable energy resources and explain why the distinction matters for sustainability.
A focused answer to APES Topic 6.1, covering the difference between renewable and nonrenewable energy resources, examples of each, the idea of potentially renewable resources, and why the distinction matters for sustainability, with a worked depletion calculation.
- Topic 6.8 Solar Energy: describe how solar energy is captured using photovoltaic, active and passive systems and evaluate its benefits and drawbacks.
A focused answer to APES Topic 6.8, covering photovoltaic cells, active and passive solar heating, the benefits (renewable, low emissions) and drawbacks (intermittency, land, cost) of solar energy, and a worked photovoltaic output calculation.
- Topic 6.13 Energy Conservation: describe strategies for energy conservation and efficiency and explain how they reduce environmental impact.
A focused answer to APES Topic 6.13, covering energy conservation and efficiency strategies (efficient vehicles, appliances, lighting, insulation, public transport, CAFE standards), the difference between conservation and efficiency, and how they reduce impact, with a worked energy-saving calculation.
- Topic 4.5 Global Wind Patterns: explain how uneven solar heating and the Coriolis effect drive atmospheric circulation cells and global wind belts.
A focused answer to APES Topic 4.5, covering uneven solar heating, convection and the Hadley, Ferrel and polar cells, the Coriolis effect, the trade winds and westerlies, and why deserts and rainforests sit where they do, with a worked latitude-climate question.
- Topic 6.4 Distribution of Natural Energy Resources: explain why energy resources are unevenly distributed and the consequences of that uneven distribution.
A focused answer to APES Topic 6.4, covering why fossil fuels and renewable resources are unevenly distributed across the globe, how geology and geography determine availability, and the economic and political consequences of that uneven distribution, with a worked import dependence calculation.
Sources & how we know this
- AP Environmental Science Course and Exam Description — College Board (2020)